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The original JA Purity template was provided from JoomlArt.com as a zip but the latest files have been installed along with Joomla. The relevant files, XXXXX and XXXX, are in the following directories:

templates/ja_purity
XXXXX.php
css/
XXXXX.css

If you've been following the tutorial you can download a tutorial version of the template that installs to the following directory: